I've never heard that term used in the midwest U.S., but my guess is that it's something that if you're not doing it, then you ain't really playin' the blues anyway. In general, I'd say that the further you go back with the blues guys, the more grease you'll find... like Robert Johnson, the Kings,for guitar, and the Sonny Boys, etc., for harp.

I get the idea,I've lived on both coasts and now I'm in the middle and I have honestly never heard it referred to guitar playing.I'm sitting here running 70 or 80 years of recorded music through my head and I just can't associate the word with a sound.It's like tone.Look at the guitar and amp ads from the 60,s and 70,s.It wasn't a big factor.Now it's the first thing they mention.I do better with Smokey.Billie Holiday,Charlie Parker,some Sinatra ballads.A lot of stuff comes to mind...It's just a matter of when you came up through the ranks.People weren't in the habit of communicating with total strangers and having to be descriptive.I'm trying to learn.Old habits die hard..l

I've only heard the term a few times. (I've bought parts from a Canadian vendor "Greasy groove". I've heard it a couple of times where the context led me to believe it meant a fat, overdriven tone. Beyond tat, no idea.

The pick guard looks pretty cool.NICE guitar!! I think clifford d is from Cali.Maybe started in New England.The only song that came to mind was "Love that dirty water" the Standells Oh wo Boston you're my home

Funny thing about the Standells: They're not from Boston. I always thought they took their name from their amps, but that might just be urban legend. (Perhaps along with he song being inspired by the Lead Singer and his girlfriend getting mugged on the Charles River Esplanade: "That's where you'll find me, along with lovers, muggers and thieves" ).